Blockchain in cybersecurity by decentralizing data, reducing the risk of centralized attacks. Its cryptographic techniques ensure data integrity, authentication, and confidentiality. Blockchain secures sensitive information, such as identity and financial data, using tamper-proof records. Smart contracts automate secure operations, minimizing human errors. From secure voting systems to enhanced IoT protection, blockchain transforms cybersecurity by offering resilience, transparency, and efficiency. Its decentralized nature empowers industries to combat cyber threats effectively while ensuring trust and security in digital environments.